<template>
  <div>
    <!-- 顶部面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-row>
        <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" show-icon :closable="false">
        </el-alert>
      </el-row>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectedKeys" :options="CategoriesList" :props="cascaderProps" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogShow">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 扩展列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#">
            </el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" @click="editDialogShow(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogShow">添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 扩展列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#">
            </el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" @click="editDialogShow(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form ref="addParamsRef" :model="addParamsForm" :rules="addParamsRules" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addParamsForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form ref="editParamsRef" :model="editParamsForm" :rules="addParamsRules" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editParamsForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'MyParams',
  data() {
    return {
      // 商品分类数据
      CategoriesList: [],
      // 查询参数
      queryInfo: {
        type: 3,
        pagenum: '',
        pagesize: ''
      },
      // 指定级联选择器的配置对象
      cascaderProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedKeys: [],
      // 被激活的页签页
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 控制添加参数对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数对话框的数据
      addParamsForm: {
        id: '',
        attr_name: ''
      },
      // 添加参数对话框的验证规则对象
      addParamsRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改参数对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editParamsForm: {}
    }
  },
  created() {
    this.getCategories()
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedKeys.length === 0) return true
      return false
    },
    // 单签选中的三级分类的Id
    catedId() {
      if (this.selectedKeys.length === 0) return null
      return this.selectedKeys[2]
    },
    // 对话框的标题
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态参数'
    }
  },
  methods: {
    // 获取商品分类数据
    async getCategories() {
      const { data: res } = await this.$http.get('categories', this.queryInfo)
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败！')
      this.CategoriesList = res.data
    },
    // 级联选择器发生改变函数
    handleChange(newValue) {
      this.getParamsDate()
    },
    // tab 页签点击事件的处理函数
    handleClick() {
      this.getParamsDate()
    },
    // 获取参数的列表数据
    async getParamsDate() {
      // 证明选中的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      // 证明选中的是三级分类
      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.catedId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputVisible = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addParamsRef.resetFields()
    },
    // 添加对话框的显示事件
    addDialogShow() {
      this.addDialogVisible = true
    },
    // 添加对话框的确定点击事件
    async addParams() {
      // 添加表单的预验证
      this.$refs.addParamsRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`categories/${this.catedId}/attributes`, { attr_name: this.addParamsForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.$message.success('添加分类成功！')
        this.getParamsDate()
        this.addDialogVisible = false
      })
    },
    // 修改参数对话框的关闭事件
    editDialogClosed() {},
    // 修改对话框的显示事件
    async editDialogShow(id) {
      const { data: res } = await this.$http.get(`categories/${this.catedId}/attributes/${id}`, { attr_sel: this.activeName })
      if (res.meta.status !== 200) return this.$message.error('获取分类失败！')
      this.editParamsForm = res.data
      this.editDialogVisible = true
    },
    // 修改对话框的确定事件
    async editParams() {
      this.$refs.editParamsRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.put(`categories/${this.catedId}/attributes/${this.editParamsForm.attr_id}`, { attr_name: this.editParamsForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) return this.$message.error('更新参数失败！')
        this.$message.success('更新参数成功！')
        this.getParamsDate()
        this.editDialogVisible = false
      })
    },
    // 删除参数的方法
    async deleteParams(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.catedId}/attributes/${id}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
      this.$message.success('删除参数成功！')
      this.getParamsDate()
    },
    // 文本框失去了焦点，或按下了 enter 都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      // 如果没有 return 则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将对 attr_vals 的操作，保存到数据库中
    async saveAttrVals(row) {
      // 需要发起请求，保存这次 操作
      const { data: res } = await this.$http.put(`categories/${this.catedId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败！')
      this.$message.success('修改参数项成功！')
    },
    // 删除对应的参数可选项
    handleClosed(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin-left: 20px;
}
.input-new-tag {
  margin-left: 20px;
  width: 150px;
}
.button-new-tag {
  margin-left: 20px;
}
</style>
